Register note from Josephus (nprofile…5jps), who asked for Korean and offered to bring native speakers in: a machine pass will reach for the textbook-polite form where Koreans, especially younger ones, would use something plainer — his example is 천만에요 for "you're welcome", which he describes as a borrowed Americanism rather than what people actually say to each other (아무것도 아닙니다 being the ordinary one).
Nothing in en.xml is literally "you're welcome", but the same tilt runs through every string the app says *to* the person — the empty states, the confirmations, the error lines, the onboarding copy. So for ko.xml the first pass is a draft to be read by a native speaker before it is offered in Settings, the same loop as Italian (#315a7165): corrections come to me in sc-testing and I batch them onto this issue. Worth not polishing the machine output for fluency in the meantime — a fluent wrong register is harder to spot than an awkward one.